Mexico: 7.5 earthquake on Good Friday had warning

Mexico City had 71 seconds of warning before shaking from a 7.2 earthquake about 200 miles away rumbled into the capital, thanks to central Mexico’s 21-year-old early quake warning system, officials said Friday. It’s a system that California still lacks.
The Mexican warning system could be seen on television (video below), when Televisa news announcer Eduardo Salazar calmly tells viewers that at 9:27 a.m. a seismic alert went off, triggering a shrieking whine on the broadcast. “At this moment, we have felt absolutely nothing,” the anchor says initially.
More than a minute after the first warning, shaking rolls through the television studio in Mexico City, strong enough to knock the news anchor from his stance. His voice strains as the shaking worsens, and he says the studios’s lights are swaying and that some of his staff are preparing to leave. He speaks louder: “It’s a strong earthquake.”